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<br />The area between the floodway and 100-year flood plain boundaries <br />is termed the floodway fring~. The floodway fringe encoDqlasses <br />the portion of the flood plain that could be completely obstructed <br />without increasing the water'-surface elevation of the 100-year <br />flood by more than 1.0 foot at any point. Typical relationships <br />between the floodway and the, floodway fringe and their <br />significance to flood plain pevelopment are shown in Figure 2. <br /> <br />I ~ <br /> <br />100-YEAR fiLOOD PLAIN <br /> <br />~ I <br /> <br />FLOODWA Y <br />FRINGE <br /> <br /> <br />FLOODWAY <br /> <br />FLOODWAY <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FLOODWAV <br /> <br /> <br />AREA OF FLOOD PLAIN THAT COULD <br />BE USED FOR DEVELOPMENT BY <br />RAISING GROUND <br /> <br /> <br />o <br /> <br />SURCHARGE- <br /> <br />FLOOD ELEVATION <br />BEFORE ENCROACHMENT <br />ON FLOOD PLAIN <br /> <br />LINE AS IS THE FLOOD ELEVATION BEFORE ENCROACH~ENT. <br />LINE CD IS THE FLOOD ELEVATION AFTER ENCAOACHME,NT. <br />.SURCHARGE ISNOTTO ExceeD 1.0 FOOT (FEMA AEQUIR,EMENT) OR LESSER AMOUNT IF SPECIFIED BY STATE. <br /> <br />Figure 2. Floodway Schematic <br /> <br />5.0 INSURANCE APPLICATION <br /> <br />For flood insurance rating purpos~s. flood insurance zone designations <br />are assigned to a community based pn the results of the engineering <br />analyses. These zones are as fol1;ows: <br /> <br />Zone A <br /> <br />Zone A is the flood insuranqe rate zone that corresponds to the <br />100-year flood plains that i\re detemined in the Flood Insurance <br />Study by approximate method.. Because detailed hydraulic analyses <br />are not performed for such I\reas. no base flood elevations or <br />depths are shown this zone. <br /> <br />Zone AE <br /> <br />Zone AE is the flood insurance rate zone that corresponds to the <br />100-year flood plains that are determined in the Flood Insurance <br />Study by detailed methods. :Whole-foot base flood elevations <br />, <br />derived from the detailed hlldraulic analyses are shown at selected <br />intervals within this zone. . <br /> <br />44 <br />